XML Format Issue

Here's that function and related ones. They are all taken from the Roku example code.

Function validstr(obj As Dynamic) As String
    if isnonemptystr(obj) return obj
    return ""
End Function

Function isstr(obj as dynamic) As Boolean
    if obj = invalid return false
    if GetInterface(obj, "ifString") = invalid return false
    return true
End Function

Function isnonemptystr(obj)
    if isnullorempty(obj) return false
    return true
End Function

Function isnullorempty(obj)
    if obj = invalid return true
    if not isstr(obj) return true
    if Len(obj) = 0 return true
    return false
End Function

The text in this particular example is being displayed on a "roSpringboardScreen" if you think that might make a difference.